JP2001179030A - Oxygen/nitrogen concentrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the start of an air compressor and to simultaneously suppress power loss efficiently even at a time of continuous operation while reducing power loss even at a time of the alteration of the production amount of gas. SOLUTION: A three-phase AC type air compressor or three-phase AC type turbo-charger vacuum pump is driven by an inverter to be changed in its number of rotations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a PSA method or a VS method.
In an oxygen / nitrogen concentrator based on the method A, the present invention relates to adopting a three-phase AC air compressor for an air pump and driving an inverter in order to reduce power loss and obtain high efficiency.

[0002]

2. Description of the Related Art In a conventional oxygen / nitrogen concentrator, a large amount of electric power is required at the time of starting an air compressor, and there is a large electric power loss even during continuous operation. In addition, since it was impossible to change the amount of supplied air, it was difficult to efficiently control the power loss while changing the production amount of oxygen and nitrogen.

[0003]

In the conventional oxygen / nitrogen concentrator, a large amount of electric power is required at the time of starting the compressor. Therefore, the electric power loss is large even in the continuous operation. Therefore, there was a problem that power loss was large because it was impossible to change the amount of supplied air. An object of the present invention is to provide an efficient device with small power loss by controlling the number of revolutions of a compressor.

[0004]

In order to achieve the above object, in the oxygen / nitrogen concentrator according to the present invention, an inverter is used for a three-phase AC type air compressor, and the rotation speed is changed. Efficiently suppresses power loss according to changes in the power required for starting the compressor, the power required for continuous operation, and the oxygen / nitrogen production.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a diagram showing the PSA method and FIG. 2 is a diagram showing the VSA method.

In FIG. 1, a three-phase AC air compressor (3) feeds raw air through an air filter (2).
Is supplied to the entrance side. The raw material air pressurized from the outlet side of the air compressor (3) is cooled by the coiled cooling pipe (4), and the water drain is separated through the drain separator (5) by the instantaneous opening of the solenoid valve (6). It is discharged outside.

[0007] The raw material air separated by water drain flows to solenoid valves (7) and (8). The solenoid valves (7) and (8) repeat opening and closing of the alternating operation at a constant cycle. The gas adsorption tanks (13) and (14) are filled with activated alumina as a desiccant and synthetic zeolite as an adsorbent. Raw material air is introduced into the adsorption tanks (13) and (14) in an alternating operation and exhausted. Gas is discharged to the outside through the solenoid valves (9) and (10) in an alternating operation.

[0008] Oxygen or nitrogen of the production gas is introduced from the opposite side of the adsorption tanks (13) and (14) to the buffer tank (20) through the check valves (18) and (19). The discharge pressure of the production gas is equalized by the pressure regulator (21), and oxygen or nitrogen of the production gas is taken out through the flow control valve (22).

In this device, by controlling the inverter (1) by using the microprocessor (23) or other control device, it becomes possible to operate the three-phase AC air compressor efficiently with reduced power loss. .

In FIG. 2, raw air is supplied to a three-phase AC air compressor (2) through an air filter (26).
It is supplied to the inlet side of 7). Air compressor (2
The raw material air pressurized from the outlet side of 7) is cooled by the coiled cooling pipe (28), and is drained by the drain separator (29).
Through this, the water drain is separated by the instantaneous opening of the solenoid valve (30) and discharged to the outside.

The raw material air separated from the water drain is supplied to a solenoid valve (3
1) Flow to (32). The solenoid valves (31) and (32) repeat opening and closing of the alternating operation at a constant cycle. Activated alumina is used as a desiccant in the gas adsorption tanks (35) and (37).
A synthetic zeolite is packed as an adsorbent. Raw material air is introduced into the adsorption tanks (35) and (37) during the alternating operation, and exhaust gas is discharged to the vacuum chamber (36) during the alternating operation. The vacuum chamber (36) is evacuated by a three-phase AC turbocharger vacuum pump (38) or a general-purpose turbocharger vacuum pump.

In this apparatus, the adsorption tank (35)
The pressure swing width of (37) is wide, and the inverter (2)
4) By using a microprocessor (47) or other control device for (25), a three-phase AC air compressor (27) and a three-phase AC turbocharger vacuum pump or a general-purpose turbocharger vacuum pump (3) are used.
8) can be operated efficiently with reduced power loss. Oxygen or nitrogen of the production gas is supplied from the opposite side of the adsorption tank through the check valves (42) and (43) to the buffer tank (4).
4) is introduced. The discharge pressure of the production gas is equalized by the pressure regulator (45), and oxygen / nitrogen as the production gas is taken out through the flow control valve (46).

[0013]

Since the present invention is configured as described above, it has the following effects.

By using the inverter, the number of revolutions is gradually increased to facilitate the start of the air compressor.

During continuous operation, the power loss is efficiently reduced by 30 to 4
It is possible to operate the air compressor with 5% reduction.

[0016] Even if the production gas amount is changed, it is possible to efficiently operate the air compressor while suppressing the power loss.

[Brief description of the drawings]

FIG. 1 is a flow chart of an oxygen / nitrogen concentrator of a PSA method.

FIG. 2 is a flow chart of a VSA method oxygen / nitrogen concentrator.

[Explanation of symbols]

 11. Silencer 12. Silencer 15. Orifice 16. Solenoid valve 17. Solenoid valve 39. Solenoid valve 40. Solenoid valve 41. Orifice

Claims (2)

[Claims] 1. In an oxygen / nitrogen concentrator based on the PSA method or the VSA method, a three-phase AC air compressor is adopted for an air pump as a functional element, and the inverter is driven to reduce power loss and achieve high efficiency. An apparatus characterized in that it obtains. 2. The apparatus according to claim 1, wherein a microprocessor control is performed according to the purpose of use in order to reduce power loss and obtain high efficiency.